Judg3's Journal: Building a battery backup system - any ideas?

All of these in one backpack:

• An iPaq
• Dual PC-card sleeve for ipaq, GPS Unit & Orinoco wifi card w/ external antenna
• An iPod
• RIM Blackberry phone

Now, my problem - keeping all of these devices properly charged at all times.
Well, really, thats not the big problem, everything but the ipaq is good for at least 12 hours - but since I plan on embedding these devices into the backpack, I'd like to find a simple sleek solution for plugging them all in with a simple cable outside the backpack.

As an added bonus, I'd like to rig up some sort of UPS which would keep the batteries charged for a bit after I pull it off the grid.

Anyone have any ideas on a good way to do this? I've been knocking around a few ideas, but nothing has given me the big "AH HA!" that I'm looking for.

ALSO - is it possible to connect several iPaq batteries in parallel? That might do the trick, but I wonder if the ipaq would know about the extra power. Damn, I wish I knew more about electricity.

It's a good thing that along with this ipaq 4155 I was given an older 3xxx series (Mainly, because the 4155 doesn't have a sleeve for PCMCIA, and it's internal wifi chipset doesn't work with ministumbler)

A couple of links

[sanctimonius hypocrt]

Not exactly what you want, but Brad Templeton's Solar Powered PC [4brad.com] might have some links you can use. He also has an article on living on 12 volt power without much generator use [templetons.com].

Re:A couple of links

[Judg3]

Ah, thank you - those links to help me out!

I don't *really* need to do this, since I wouldn't usually be more then 3-4 hours from an outlet, but it just seems more geeky to include a charger then to just have a backpack with a bunch of devices in it hehe